Pneumatic tire and run-flat tire

Patent metadata

Field	Value
Publication number	US-10017634-B2
Application number	US-201615135831-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	May 20, 2015
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

Provided is a pneumatic tire including a sidewall that has a good balance of excellent handling stability, rolling resistance, and durability and further has excellent flex crack growth resistance. The sidewall is formed from a modified cellulose fiber-containing rubber composition that is allowed to simultaneously achieve excellent rigidity, excellent tensile properties, and low energy loss by improving the dispersibility of the cellulose fiber in rubber. The present invention relates to a pneumatic tire including a sidewall formed from a modified cellulose fiber-containing rubber composition, the modified cellulose fiber-containing rubber composition containing a modified cellulose fiber (A) obtained by adding a C15 or higher cyclic polybasic acid anhydride (a) containing a hydrophobic group to a cellulose fiber through esterification, a dispersing polymer (B) having a softening point of 135° C. or lower, and a rubber component (C).

First claim

The invention claimed is:

1. A pneumatic tire, comprising a sidewall formed from a modified cellulose fiber-containing rubber composition,
the modified cellulose fiber-containing rubber composition comprising
a modified cellulose fiber (A) obtained by adding a C15 or higher cyclic polybasic acid anhydride (a) containing a hydrophobic group to a cellulose fiber through esterification,
a dispersing polymer (B) having a softening point of 135° C. or lower, and
a rubber component (C).

2. A pneumatic tire, comprising a base tread formed from a modified cellulose fiber-containing rubber composition,
the modified cellulose fiber-containing rubber composition comprising
a modified cellulose fiber (A) obtained by adding a C15 or higher cyclic polybasic acid anhydride (a) containing a hydrophobic group to a cellulose fiber through esterification,
a dispersing polymer (B) having a softening point of 135° C. or lower, and
a rubber component (C).

3. A pneumatic tire, comprising a breaker topping formed from a modified cellulose fiber-containing rubber composition,
the modified cellulose fiber-containing rubber composition comprising
a modified cellulose fiber (A) obtained by adding a C15 or higher cyclic polybasic acid anhydride (a) containing a hydrophobic group to a cellulose fiber through esterification,
a dispersing polymer (B) having a softening point of 135° C. or lower, and
a rubber component (C).

4. A pneumatic tire, comprising an innerliner formed from a modified cellulose fiber-containing rubber composition,
the modified cellulose fiber-containing rubber composition comprising
a modified cellulose fiber (A) obtained by adding a C15 or higher cyclic polybasic acid anhydride (a) containing a hydrophobic group to a cellulose fiber through esterification,
a dispersing polymer (B) having a softening point of 135° C. or lower, and
a rubber component (C).

5. A pneumatic tire, comprising at least one selected from the group consisting of a bead apex, a clinch apex, a ply topping, and a tread each formed from a modified cellulose fiber-containing rubber composition,
the modified cellulose fiber-containing rubber composition comprising
a modified cellulose fiber (A) obtained by adding a C15 or higher cyclic polybasic acid anhydride (a) containing a hydrophobic group to a cellulose fiber through esterification,
a dispersing polymer (B) having a softening point of 135° C. or lower, and
a rubber component (C).

6. The pneumatic tire according to claim 1 , wherein the cyclic polybasic acid anhydride (a) is at least one selected from the group consisting of acid anhydride group-containing petroleum resins and acid anhydride group-containing coal resins.

7. The pneumatic tire according to claim 1 , wherein the dispersing polymer (B) is at least one selected from the group consisting of petroleum resins and coal resins.

8. The pneumatic tire according to claim 1 , wherein the rubber component (C) is at least one selected from the group consisting of natural rubber, modified natural rubbers, synthetic rubbers, and modified synthetic rubbers.

9. The pneumatic tire according to claim 1 , wherein the modified cellulose fiber-containing rubber composition comprises the modified cellulose fiber (A) in an amount of 0.01 to 30 parts by mass relative to 100 parts by mass of the rubber component (C).

10. The pneumatic tire according to claim 1 ,
wherein the modified cellulose fiber-containing rubber composition is obtained by the steps of:
kneading the modified cellulose fiber (A) with the dispersing polymer (B) to give a kneaded mixture, and
kneading the kneaded mixture with the rubber component (C).

11. A run-flat tire, comprising a lining strip layer formed from a modified cellulose fiber-containing rubber composition,
the modified cellulose fiber-containing rubber composition comprising
a modified cellulose fiber (A) obtained by adding a C15 or higher cyclic polybasic acid anhydride (a) containing a hydrophobic group to a cellulose fiber through esterification,
a dispersing polymer (B) having a softening point of 135° C. or lower, and
a rubber component (C).

12. The run-flat tire according to claim 11 , wherein the cyclic polybasic acid anhydride (a) is at least one selected from the group consisting of acid anhydride group-containing petroleum resins and acid anhydride group-containing coal resins.

13. The run-flat tire according to claim 11 , wherein the dispersing polymer (B) is at least one selected from the group consisting of petroleum resins and coal resins.

14. The run-flat tire according to claim 11 ,
wherein the rubber component (C) is at least one selected from the group consisting of natural rubber, modified natural rubbers, synthetic rubbers, and modified synthetic rubbers.

15. The run-flat tire according to claim 11 , wherein the modified cellulose fiber-containing rubber composition comprises the modified cellulose fiber (A) in an amount of 0.01 to 30 parts by mass relative to 100 parts by mass of the rubber component (C).

16. The run-flat tire according to claim 11 , wherein the modified cellulose fiber-containing rubber composition is obtained by the steps of:
kneading the modified cellulose fiber (A) with the dispersing polymer (B) to give a kneaded mixture, and
kneading the kneaded mixture with the rubber component (C).

17. The pneumatic tire according to claim 2 , wherein the cyclic polybasic acid anhydride (a) is at least one selected from the group consisting of acid anhydride group-containing petroleum resins and acid anhydride group-containing coal resins.

18. The pneumatic tire according to claim 2 , wherein the dispersing polymer (B) is at least one selected from the group consisting of petroleum resins and coal resins.

19. The pneumatic tire according to claim 2 , wherein the rubber component (C) is at least one selected from the group consisting of natural rubber, modified natural rubbers, synthetic rubbers, and modified synthetic rubbers.

20. The pneumatic tire according to claim 2 , wherein the modified cellulose fiber-containing rubber composition comprises the modified cellulose fiber (A) in an amount of 0.01 to 30 parts by mass relative to 100 parts by mass of the rubber component (C).

21. The pneumatic tire according to claim 2 ,
wherein the modified cellulose fiber-containing rubber composition is obtained by the steps of:
kneading the modified cellulose fiber (A) with the dispersing polymer (B) to give a kneaded mixture, and
kneading the kneaded mixture with the rubber component (C).

22. The pneumatic tire according to claim 3 , wherein the cyclic polybasic acid anhydride (a) is at least one selected from the group consisting of acid anhydride group-containing petroleum resins and acid anhydride group-containing coal resins.

23. The pneumatic tire according to claim 3 , wherein the dispersing polymer (B) is at least one selected from the group consisting of petroleum resins and coal resins.

24. The pneumatic tire according to claim 3 , wherein the rubber component (C) is at least one selected from the group consisting of natural rubber, modified natural rubbers, synthetic rubbers, and modified synthetic rubbers.

25. The pneumatic tire according to claim 3 , wherein the modified cellulose fiber-containing rubber composition comprises the modified cellulose fiber (A) in an amount of 0.01 to 30 parts by mass relative to 100 parts by mass of the rubber component (C)

Assignees

• Sumitomo Rubber Ind

Inventors

• Miyazaki Sumiko
• Watanabe Kenya
• Miyamori Ryo

Classifications

• D01F2/28

  from organic cellulose esters or ethers, e.g. cellulose acetate · CPC title

• C08L2205/16

  Fibres; Fibrils · CPC title

• C08L23/22

  Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins · CPC title

• C08L9/06

  Copolymers with styrene · CPC title

• C08L9/00 Primary

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title